Steam-boiler.



No. 852,481. 'PAT-ENTBD MAY 7, 1907 1); YWIGERT.

STEAM BOILER.

nrmonron FILED 0011s. 1905.

Witnesses Inventor.

Jami? Wyzij Attprn eys 1n: Mamas PETERS :0. WASHINGTON. oc DAVID WIGERT, OF GREENBUSH, ILLINOIS.

STEAM-BOILER.

Specification of Letters Patent.

Patented May '7, 1907.

Application filed October 18,1905. Serial No. 283,315.

To alt whont it ntcty concern:

Be it known that I, DAVID WIGERT, a citizen of the United States, residing at Greenbush, in the county of Warren and State of Illinois, have invented a new and useful Grate, of which the following is a specification.

This invention relates to the construction of steam boilers, and has for its principal object to provide a novel form of water grate and water grate connections, whereby a continuous circulation through the tubes which form the grate may be maintained for the purpose of utilizing the heat of combustion, and at the same time protecting the grate.

A further object of the invention is to provide a water grate so constructed and arranged as to be free for expansion and contraction without danger of rupturing any portion of the grate or any of the connections, all of the parts being comparatively free from strain and the various grate members being free to move independently of each other in accordance with the extent to which they expand or contract.

A still further object of the invention is to provide a water grate adapted especially for use in down draft fire boxes, the grate being providedwith horizontal fuel supporting surfaces and with vertical extensions which are exposed to the action of the products of combustion after the latter pass down between the horizontal portions of the grate.

With these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts, hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims, it being understood that various changes in the form, proportions, size and minor details of the structure may be made Without departing from the spirit or sacrificing any of the advanta es of the invention.

In t e accompanying drawings :Figure 1 is a vertical section of a steam boiler furnace provided with a water grate constructed in accordance with the invention. Fig. 2 is a perspective view of the boiler, the grate and their connections. Fig. 3 is a front elevation of the boiler proper without the inclosing walls or casing.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

The boiler illustrated comprises an upper cylindrical portion 10, provided with longitudinal tubes 11 of the usual type, the latter discharging into a stack at the front end of the boiler. The rear end of the boiler is pro vided with an enlarged rectangular portion 12, the four sides of which form flue sheets, and extending through this portion of the boiler are two sets of flues 13 and 14, the sets alternating, as shown. The flues 13 extend in a direction parallel with the upper flues 11, while the flues 14 extend transversely of the casing 12, or at a right angle to the flues 11 and 13, thus affording numerous passages for the products of combustion before the latter finally enter the rear ends of the upper flues 11.

Immediately in front of the rectangular portion 12 of the boiler is an auxiliary water heater 16 that is of generally rectangular form, and is provided at its upper edge with a semi-circular recess 17 that fits around the lower surface of the tubular portion 10 of the boiler, but does not make contact therewith, so that there will be no interference with expansion and contraction, and a small space is formed through which a portion of the products of combustion may pass along under the lower curved surface of the portion 10 of the boiler in the direction of the escape flue or stack. The upper end of the water heating chamber 16, and the rear portion of the boiler are connected by two circulating pipes 18, and the opposite edges of the lower portion of said chamber are connected by pipes 19 to horizontally disposed pipes 20, which are connected at their rear ends to a vertically disposed pipe 21, that is connected to the lower portion of the section 12 of the boiler.

Arranged in front of the fire-box, and generally supported by the brick or other housing of the boiler is a rectangular or cylindrical water box 22, the opposite ends of which are connected to the front ends of the pipes 20. These boxes serve in connection with the rear portion of the chamber 16 for the support of the grate members 25.

Each of the grate members 25 is in the form of a single tube bent in Z-form, or may be formed of a number of pipe sections connected by elbows in the usual manner. The short vertically extending portion 26 of each grate member has its lower end connected to the water box, and its upper end is connected to the section 26 which forms the fuel supporting surface, and at the rear end of the section 26 is a vertically extended section 27 that extends up into the space between the main boiler and the auxiliary chamber 16, and is connected to the rear wall of the latter at a point some distance below the cylindrical portion 10 of the boiler.

When fuel is placed in the fire-box, and the fire started, the draft willbe in the direction indicated by the arrow, and only the fuel directly supported by the grate, or directly in contact with the grate will be in a state of active combustion while the gas evolved by the partial coking process of the fuel above combustion from the fines 13 into the fines 14, but this portion of the structure is shown in my former Patent No. 812,908 dated February 12, 1906, and forms no part of the pres ent invention.

The invention in the present instance resides principally in the water grate tubes and their connections, and it will be observed that by arranging the grate tubes in the man'- ner described said tubes are free for independent expansion and contraction Without danger of rupture. They are, furthermore, so connected that a continuous circulation of water is maintained therethrough, and the tubes will last for a considerable length of time, without burning out, and when burned out may be readily renewed without inter- 5 each tube having a short vertical section con-- nected to the Water box, an approximately horizontal section extending rearwardly from the vertical section and forming a fuel supporting surface, and an upwardly extending section arranged between the boiler and the auxiliary heater and connected to the upper portion of the latter, and circulating pipes connecting thewater box to the lower end of.

the boiler proper and to the lower end of the auxiliary heater.

2. The combination with a boiler having an auxiliary water heater spaced therefrom in front of the main body of the boiler, of a water box arranged at the front of the fire box and having a circulating connection with the auxiliary heater and the main body of the boiler, and a grate formed of independent tubes, each tube having a short vertical section connected to the top of the water box, an approximately horizontal section extending rearward from the vertical section and forming a fuel supporting surface, and an upwardly extending section between the boiler and the auxiliary heater and connected to the rear face of the upper portion of the latter.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses:

DAVID WIGERT.

Witnesses:

C. H. MAsoN, LEE I DARNEILLE. 

